Quote Originally Posted by The Lord Flashheart View Post
I used to use a US cleaner to get the spotless, eventually got bored of rinsing, drying, etc.

Now I tumble to clean up the outside ( notionally to stop the inside of my dies getting scratched) and have found bugger all difference in group size.

I haven't done a ES/SD velocity test but that would seem to be the way to set the issue aside one way or another.
Makes hardly any difference if the insides are spotless but I prefer to clean the inside of the neck with a bristle brush so everything is consistent.
Shooting game or at our target ranges what we do in case prep is adequate it's the top league boys who try to make every made up round 100% identical.....they seem to forget they is still the idiot factor behind the trigger lol